GATE CE 2016 Set 1 — Question 61
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Environmental Engineering → Air Pollution → Electrostatic Precipitator
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Question
An electrostatic precipitator (ESP) with 5600 m of collector plate area is 96 percent efficient in treating 185 m/s of flue gas from a 200 MW thermal power plant. It was found that in order to achieve 97 percent efficiency, the collector plate area should be 6100 m. In order to increase the efficiency to 99 percent, the ESP collector plate area (expressed in m) would be ______
Correct answer
8000 to 8040
Solution
The efficiency () of an electrostatic precipitator is given by the Deutsch-Anderson equation:where:
= effective drift velocity
= collector plate area
= gas flow rate
Let . Then .
From the first case:
, m
From the second case:
, m
(The value of is consistent).
For the third case:
, find
m
The required collector plate area is approximately 8012 m.
= effective drift velocity
= collector plate area
= gas flow rate
Let . Then .
From the first case:
, m
From the second case:
, m
(The value of is consistent).
For the third case:
, find
m
The required collector plate area is approximately 8012 m.
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